In an interview with Screenrant, the director of WandaVision, Matt Shakman, explained the real-world inspiration for SWORD.
While WandaVision introduced a number of major new characters into the MCU, it also introduced a significant new organization from Marvel Comics, named SWORD.
Clearly, while the story of Westview is now at an end, the role of SWORD within the MCU is only just beginning.
We already know Fury has his own Skrull doppelganger, and another Skrull showed up at the end of WandaVision as a member of SWORD.